Mac sandbox created but no NSUserDefaults plist

Question

I\'m trying to track down some issues arising from sandbox creation. Under multiple circumstances it appears that an NSUserDefaults .plist file is not created in Data/Libra

Answer 1

Just moving this into a full answer so it doesn't get missed. I only read it after trying the other solutions when this was solved in a few clicks.

@greg and @mehals answer in the comments section for the first solution solved it for me without needing to change any of my code

Killing cfprefsd did the trick from activity manager.